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DIAGNOSIS AND SOLUTION (CONT)
Table 21—Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution (E4/E5/F1/F2/F3)
Error Code
Malfunction Decision Conditions
Supposed Causes
Check the connection
between temperature
sensor and PCB. Is it
Measure the resistance
value of the sensor. Is it
Replace indoor or outdoor
E4/E5/F1/F2/F3
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
S
Wiring mistake
S
Sensor Faulty
properly wired?
Yes
within acceptable
parameters?
Yes
main PCB
Fig. 20 – Test
No
Ensure proper connection
No
Replace the sensor
25
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